Karabiner - for complex key shortcuts, I personally use it for caps+hjkl - arrows, caps+space -enter, caps+bcksp - delete, and some other hyper keys
Spectacle - window snapping - send windows to another monitor, half-screen left, half screen right
Alfred - spotlight on steroids
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4 apps that make macOS special for me:
Karabiner - pqrs.org/osx/karabiner/
spectacle - spectacleapp.com
Alfred - alfredapp.com
brew - brew.sh
Karabiner - for complex key shortcuts, I personally use it for caps+hjkl - arrows, caps+space -enter, caps+bcksp - delete, and some other hyper keys
Spectacle - window snapping - send windows to another monitor, half-screen left, half screen right
Alfred - spotlight on steroids